MSA DF-8500 - Page 48

DF-8500 Gas Detector
Note
：
The menu item “FACTORY DEFAULT” usually displays 0
When set to 1, instrument will automatically restart and display
“BOOT” . In addition, all parameters will be restored to factory
default setting, there is a need to re-
set gas type, zero calibration
and gain calibration.
[M-05] -- Sensor replacement
For the toxic gas detector, you can replace the sensor through this menu item with
the device energized and reset the counter of sensor service time (in days).
(1) Press “+” to select menu item M-05.
49
Submenu
Parameter
Meaning
Default
Adjustable Range
Remarks
TEST GAS=
Calibration gas
concentration setting
No decimal point range:
5 ~(range-1)
Decimal point range:
0.5~(range-0.1)
μmol / mol
or %V/V
CURRENT
OFFSET=
(4~20)mA output
fine tuning
120 90 ~ 150
ALARM_L=
Low alarm
point setting
O 2 25% range:
19.5%
Others:
10% range
No decimal point range:
5~(range-1)
Decimal point range:
0.5~(range-0.1)
ALARM_H=
High alarm
point setting
O 2 25% range:
23.0%
Others:
30% range
No decimal point range:
(low alarm + 1)
~(range-1)
Decimal point range:
(low alarm + 0.1)
~(range-0.1)
ZERO TIME=
Zero calibration
countdown(second)
30 10 ~ 99
SPAN TIME=
Gain calibration
countdown(second)
O 2 , CO: 30
H 2 S: 60
ETO,
VCM:180
CH 2 O, CH 3
OH:
300
10 ~ 900
IDLE TIME=
Countdown after
gain
calibration (second)
15
10 ~ 99
4-20MA
OUTPUT
MODE
Current output
mode during
gain calibration
FLOT
4mA: The output current
is fixedat 4mA during
the calibration
FLOT:
the output current
changeswith displayed
concentrationduring
calibration
FACTORY
DEFAULT=
Restore factory
default setting
0
1: Restore factory
default setting
TEMP
SETTING=
Internal temperature
sensor calibration
NA NA
Appear only external
temperature broken
or not presence